I have myself down to 3 cities and four programs between them. There's a couple reasons I liked these places in particular.
1) All have cool, smart students.
2) All have cool, smart faculty that were actively involved in dual-degree admissions and/or administration.
3) All have faculty engaging in research that I can see myself pursuing for 4-5 years.
4) They might be willing to pay for me to hang out there for the better part of a decade.
5) They are located in or near a major city.
As for the narrowing it down further, I'm still waiting to hear whether or not I'm in at two programs and I think some of the faculty I've met at these universities would be glad to speak frankly with me about what's best for me.
As it worked out for me, most schools I didn't like rejected me, and the schools that I liked tended to look more favorably on me (either admitting or waitlisting me). Did anybody else see that or am I just bad at concealing a lack of enthusiasm?